>>7781466Not sure quite what you mean, do you mean parts for 1/12 figures, or accessories?
I personally have used Marvel Legends and Black Series figures as a base for customs where I added 3d printed parts (a mix of pieces I modeled and models from the source game with some touchup I did).
As an example, this figure is basically a marvel legends spidergirl with additions I ripped from the game files and touched up. I rescaled parts and added a balljoint socket in the helmet to attach to the original figure's balljoint, you can just get calipers and measure it.
If you mean general accessories, then remember: with 3d printing, you can just scale any model to any size, so if you can find a model of something, you can just rescale it to the size you want it to be to match your figures you want to display it with.